在Shell脚本中处理多行变量

Question

I have extracted the results of a query in a variable.

echo "$a"
TABLESPACE_NAME                  TOT_SIZE   PCT_FREE    DATAFILE
------------------------------ ---------- ----------    -----------
SYSTEM                               1000     40.625    /u01/oracle/datafile1.dbf
SYSAUX                               1000    67.2375    /u01/oracle/datafile2.dbf
USERS                                  55 96.3636364    /u01/oracle/datafile3.dbf
UNDOTBS1                             1000    98.0625    /u01/oracle/datafile4.dbf

I need to check the location of datafile ( /u01/oracle ) for space ,then add a datafile for each tablespace.

Basically what im trying to do is :-

 loop
 extract location from 4th col
 check for space availability

could you please suggest how to proceed.

Answer 1

You can use this simple awk command to print 1st and last columns for each row for the row # greater than two:

echo "$a" | awk 'NR>2 {printf "Table space name: %s and datafile name: %s\n", $1, $NF}'

This will print table name and datafile for each record.